20216880 has 120 divisors (see below), whose sum is σ = 69580368. Its totient is φ = 5257728.

The previous prime is 20216869. The next prime is 20216921. The reversal of 20216880 is 8861202.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30634 + ... + 31286.

Almost surely, 2^20216880 is an apocalyptic number.

20216880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20216880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34790184).

20216880 is an abundant number, since it is smaller than the sum of its proper divisors (49363488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20216880 is a wasteful number, since it uses less digits than its factorization.

20216880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20216880 is about 4496.3184940571. The cubic root of 20216880 is about 272.4194077525.

The spelling of 20216880 in words is "twenty million, two hundred sixteen thousand, eight hundred eighty".